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Track: Emergency Management and Public Safety
Margo Blosser
Clark County
PO Box 3000
Vancouver, WA 98666-5000
Telephone: 360-699-2391
Fax: 360-737-6046
E-mail: blossar_margo@
Computer-Aided Dispatch and ArcView: The Creation of Clark County's CADView Product
GIS Solution: Computer-aided dispatch (CAD) currently exists in many localities. Many CAD systems take calls from an enhanced 911 (E911) phone system, verify the caller's address, and assist dispatchers in dispatching fire, police and medical help. CAD systems are primarily nongraphic, text-based display. Address verification and dispatch of emergency vehicles are made based on nongraphic geofiles. While these systems and data are meticulously designed and maintained, the ability of GIS technology to display the location of E911 calls are of great assistance to E911 dispatchers. Methodology: CADView is an ArcView GIS interface linked to the CAD dispatch system that allows the display of pending calls, active calls, and active units. The system is designed for three primary functions: 1) assist dispatchers in dispatching priority 3 calls and above, 2) assist dispatchers in providing directions to the location of incidents, and 3) assist dispatchers in identifying what exists at a given location. The
CADView product is linked directly to the CAD system through a DDE connection designed by Hitech Systems Inc. of Los Angeles, California. The spatial location of E911 addresses in CADView is accomplished through a hierarchical address matching routine that matches E911 calls to the parcels centroids, Clark County Road Centerline Address file, and United States Census TIGER file. Software: CADView is written in Avenue Version 3.0 and uses GIS data developed in ArcInfo. The Hitech Systems Inc. link to ArcView is written in Visual Basic. This paper will discuss the use of interapplication communication with DDE, Avenue programming used to design the CADView interface, cartographic design of the dispatcher views, and the use of hierarchical address matching.
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